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90701.

A colourless inorganic compound(A) is soluble in water, alcohols, amines. On strong heating (A) gives a brown gas (B) and a grey residue (C) on dissolution of(A) in NH_3 a solution (D) is formed which reduces aldehydes to form silvermirror. FeSO_4 reduces solution of (A) in water aqueous solution of(A) also gives a brick red precipitate (E) with K_2CrO_4 solution Dis

Answer»

`AgCrO_4`
`AgNH_2`
`[AG(NH_3)_2]^(+)`
NONE of these

Solution :
Discussion
90702.

A colourless inorganic compound(A) is soluble in water, alcohols, amines. On strong heating (A) gives a brown gas (B) and a grey residue (C) on dissolution of(A) in NH_3 a solution (D) is formed which reduces aldehydes to form silvermirror. FeSO_4 reduces solution of (A) in water aqueous solution of(A) also gives a brick red precipitate (E) with K_2CrO_4 solution C is

Answer»

AG
`Ag_2O`
`Ag_3N`
NONE of these

Solution :
Discussion
90703.

A colourless inorganic compound (A) imparts a green colour to the flame. Its solution gives a white ppt. (B) with H_(2)SO_(4). When heated with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4), a brown red vapour/gas (C) is formed. The gas/ vapour when passed through aqueous NaOH solution, it turns into a yellow solution (D) which forms yellow precipitate (E) with CH_(3)COOH and (CH_(3)COO)_(2)Pb. with reference to above information, answe the following questions. Q. The yellow ppt. formed when (D) reacts with CH_(3)COOH and (CH_(2)COO)_(2)Pb is:

Answer»

`PbI_(2)`
`PbCrO_(4)`
`BaCrO_(4)`
`AGBR`

SOLUTION :
Discussion
90704.

A colourless inorganic compound (A) imparts a green colour to the flame. Its solution gives a white ppt. (B) with H_(2)SO_(4). When heated with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4), a brown red vapour/gas (C) is formed. The gas/ vapour when passed through aqueous NaOH solution, it turns into a yellow solution (D) which forms yellow precipitate (E) with CH_(3)COOH and (CH_(3)COO)_(2)Pb. with reference to above information, answe the following questions. Q. The liberated gas vapour (C) is:

Answer»

`Br_(2)`<BR>`NO_(2)`
`CrO_(2)Cl_(2)`
`Cl_(2)`

SOLUTION :
Discussion
90705.

A colourless inorganic compound(A) is soluble in water, alcohols, amines. On strong heating (A) gives a brown gas (B) and a grey residue (C) on dissolution of(A) in NH_3 a solution (D) is formed which reduces aldehydes to form silvermirror. FeSO_4 reduces solution of (A) in water aqueous solution of(A) also gives a brick red precipitate (E) with K_2CrO_4 solution Ais

Answer»

`[AG(NH_3)_2]^(+)`
`Ag_(2)CrO_(4)`
Ag
`AgNO_3`

SOLUTION :
Discussion
90706.

A colourless inorganic compound (P) decomposes on heating to give two products (Q) and (R). (Q) is a colourless neutral gas with a sweet odour which when burnt with phosphorous produces a strong dehydrating agent (S) while (R) is a neutral liquid at room temperature. Identify P, Q, Rand S.

Answer»

<P>

Solution :`underset"(P)"(NH_4NO_3) OVERSET(250^@C)to underset"(Q)"(N_2O) + underset"(R)"(2H_2O)`
`P_4 + underset"(Q)"(10N_2O) to underset"(S)"(P_4O_10) +10N_2`
Discussion
90707.

A colourless gas with the smell of rottenn fish is

Answer»

`H_(2)S`
`PH_(3)`
`SO_(2)`
NONE of these

Solution :`H_(2)Sto`COLOURLESS gas with unpleasant odour of rotten eggs.
`SO_(2)to` colourless gas with a pungent SUFFOCATING odour.
`PH_(3)to` colourless gas with unpleasant garlic like odour or rotten fish odour.
Discussion
90708.

A colourless gas with rotten fish small, burns spontaneously with a bright flash, giving beautiful vortex rings of white smoke is.........

Answer»

`P_(2)O_(3)`
`PH_(3)`
`P_(2)S_(5)`
`H_(2)S`

ANSWER :B
Discussion
90709.

A colourless gas which burns with blue flame and reduces CuO to Cu is:

Answer»

`N_2`
CO
`CO_2`
`NO_2`

ANSWER :B
Discussion
90710.

A colourless gas on passing through bromine water decolourises it. The gas is

Answer»

`HCL`
`HBR`
`CO_2`
`SO_2`

ANSWER :D
Discussion
90711.

A colourless fuming liquid (A) can be prepared by passing SO_(2) over phosphorous pentachloride. The liquid can readily be hydrolysed to give sulphurous acid. The compound (A) is

Answer»

`SOCl_(2)`
`SO_(2)Cl_(2)`
`SCl_(2)`
`SCl_(4)`

Answer :A
Discussion
90712.

A colourless crystalline salt 'X' is soluble in dilute HCl. On adding NaOH solution, it gives a white precipitate which is insoluble in excess of NaoH. 'X' is

Answer»

`AL_(2)(SO_(4))_(3)`
`ZnSO_(4)`
`MgSO_(4)`
`SnCl_(2)`

ANSWER :C
Discussion
90713.

A colourless (A) when place into water a heavy white turbidly of (B) solid (A) gives a close solution in conesolution in cone HCI when HCI solution is added to clear solution water ,(B) forms again (B) dissolves in dilute HCI. When H_(2)S is passed through a sespension of (A) or (B), a black precipitate (C ) forms , (C ) is insolves in yellow ammonium sulphide (NH_(4))_(2)S , cone H_(2)SO_(4) added to solid (A) liberates gas (D) gas (D) is water soluble and gives white precipitate with mercuric salts (E ) and not mercuric salt .The black precipitate (C ) dissolves in HNO_(3), (1,1) to give a solution to which H_(2)SO_(4) is added followed by addition of NH_(4)OH when a white precipitate (F) is formed (E ) gives a blackppt , (G) with solutionof sodium stannite. Compound (B ) is not soluble in

Answer»

Tartaric ric acid
HCI
`HNO_(3)`
`H_(2)SO_(4)`

Solution :`underset((A))(BiCI_(3)) +H_(2)O rarr underset("White PPT")(BiOCI darr) +underset((B))(2HCI)`
`underset((B))(BiOCI)+2HCI rarr underset((A))(BiCI_(3))+H_(2)O`
`2BiCI_(3) + 3H_(2)S rarr underset("Brown-black ppt")(Bi_(2)S_(3)darr) +6HCI`
`Bi_(2)S_(3) +8HNO_(3) rarr 2Bi(NO_(3))_(3) +3S darr +2NO +4H_(2)O`
`2Bi(NO_(3))_(3) + 3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +6HNO_(3)`
`Bi_(2)(SO_(4))_(3) +6NH_(4)OH rarr underset((F))underset("White ppt") (2Bi(OH)_(3)darr) +3(NH_(4))_(2) SO_(4)`
`2Bi(OH)_(3) +3Na_(2)SnO_(2) rarr underset("Black ppt")underset((G))(2Bi) +3Na_(2)SnO_(3) +H_(2)O`
`2BiCI_(3) +3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +underset((D))(6HCI)`
`Hg_(2)(NO_(3))_(2) +2HCI rarr underset((E))underset("White ppt")(Hg_(2)CI_(2)darr)+2HNO_(3)`
Discussion
90714.

A colourless crystalline salt, on being heated, gives a coloured gas with a pungent smell. On being passed through an AgNO_(3) solution, this gas forms a white precipitate insoluble in HNO_(3) but readily soluble in an NH_(3) solution. Which of the following reaction can lead to the above observation?

Answer»

`MgCl_(2)+H_(2)O to Mg(OH)Cl+HCl`
`(NH_(4))_(2)CO_(3) to 2NH_(3)+CO_(2)+H_(2)O`
`ZnSO_(3) to ZnO+SO_(2)`
`NaNH_(4)HPO_(4) to NaPO_(3)+NH_(3)+H_(2)O`

ANSWER :A
Discussion
90715.

A colourless crystalline salt 'x' is soluble in dilute HCl. On adding NaOH solution, it gives a white precipitate which is insoluble in excess of NaOH, 'x' is

Answer»

`Al_(2)(SO_(4))_(3)`
`ZnSO_(4)`
`MgSO_(4)`
`SnCl_(2)`

Solution :`MgSO_(4)` is COLOURLESS crystalline SALT and is soluble in dil. HCL. On adding NaOH solution it gives a white ppt of Mg `(OH)_(2)` which is insoluble in excess of NaOH.
`MgSO_(4)+2NaOH to Mg(OH)_(2)+Na_(2)SO_(4)`.
Discussion
90716.

A colourless compound X on treatment with alc. KOH gave a gaseous compound Y. The compound Y decolourises bromine water and alkaline KMnO_(4) solution but gives no precipitate with ammoniacal cuprous chloride. The compound X is :

Answer»

Ethylene <BR>Ethyne
Ethylene DIBROMIDE
ETHYL bromide

Solution :`C_(2) H_(5)Br overset(alc. KOH)rarr CH_(2) = CH_(2)`
(decolourises `Br_(2)` water and alkaline `KMnO_(4)` but does not react with ammoniacal `Cu_(2)Cl_(2)`)
Discussion
90717.

A colourless aqueous solution on adding water and on heating gave a white precipitate. The precipitate when reacted with NH_(4)Cl and NH_(4)OH in excess resulted in dissolution of some of the precipitate and a gelatinous precipitate is obtained. What is the hydroxide formed in aqueous solution?

Answer»

`ZN(OH)_(2)`
`MG(OH)_(2)`
`AL(OH)_(3)`
`Ca(OH)_(2)`.

Solution :`Al(OH)_(3)` is a gelatinous precipitate.
Discussion
90718.

A colourless (A) when place into water a heavy white turbidly of (B) solid (A) gives a close solution in conesolution in cone HCI when HCI solution is added to clear solution water ,(B) forms again (B) dissolves in dilute HCI. When H_(2)S is passed through a sespension of (A) or (B), a black precipitate (C ) forms , (C ) is insolves in yellow ammonium sulphide (NH_(4))_(2)S , cone H_(2)SO_(4) added to solid (A) liberates gas (D) gas (D) is water soluble and gives white precipitate with mercuric salts (E ) and not mercuric salt .The black precipitate (C ) dissolves in HNO_(3), (1,1) to give a solution to which H_(2)SO_(4) is added followed by addition of NH_(4)OH when a white precipitate (F) is formed (E ) gives a blackppt , (G) with solutionof sodium stannite. When compound (E ) reacts with NH_(4)OH , thenproduct is a

Answer»

White ppt
Black ppt
yellow ppt
Green ppt

Solution :`underset((A))(BiCI_(3)) +H_(2)O rarr underset("White ppt")(BiOCI darr) +underset((B))(2HCI)`
`underset((B))(BiOCI)+2HCI rarr underset((A))(BiCI_(3))+H_(2)O`
`2BiCI_(3) + 3H_(2)S rarr underset("Brown-black ppt")(Bi_(2)S_(3)darr) +6HCI`
`Bi_(2)S_(3) +8HNO_(3) rarr 2Bi(NO_(3))_(3) +3S darr +2NO +4H_(2)O`
`2Bi(NO_(3))_(3) + 3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +6HNO_(3)`
`Bi_(2)(SO_(4))_(3) +6NH_(4)OH rarr underset((F))underset("White ppt") (2Bi(OH)_(3)darr) +3(NH_(4))_(2) SO_(4)`
`2Bi(OH)_(3) +3Na_(2)SnO_(2) rarr underset("Black ppt")underset((G))(2Bi) +3Na_(2)SnO_(3) +H_(2)O`
`2BiCI_(3) +3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +underset((D))(6HCI)`
`Hg_(2)(NO_(3))_(2) +2HCI rarr underset((E))underset("White ppt")(Hg_(2)CI_(2)darr)+2HNO_(3)`
Discussion
90719.

A colourless (A) when place into water a heavy white turbidly of (B) solid (A) gives a close solution in conesolution in cone HCI when HCI solution is added to clear solution water ,(B) forms again (B) dissolves in dilute HCI. When H_(2)S is passed through a sespension of (A) or (B), a black precipitate (C ) forms , (C ) is insolves in yellow ammonium sulphide (NH_(4))_(2)S , cone H_(2)SO_(4) added to solid (A) liberates gas (D) gas (D) is water soluble and gives white precipitate with mercuric salts (E ) and not mercuric salt .The black precipitate (C ) dissolves in HNO_(3), (1,1) to give a solution to which H_(2)SO_(4) is added followed by addition of NH_(4)OH when a white precipitate (F) is formed (E ) gives a blackppt , (G) with solutionof sodium stannite. Compound (C ) is alsoformedby the following reaction

Answer»

`Ba^(2+) + S(2)O_(3)^(2-) rarr E `
`Bi^(2+) + S(2)O_(3)^(2-) rarr E `
`Bi^(2+) S(2)O_(3) overset(Delta) toE `
None of these

Solution :`underset((A))(BiCI_(3)) +H_(2)O rarr underset("White ppt")(BiOCI darr) +underset((B))(2HCI)`
`underset((B))(BiOCI)+2HCI rarr underset((A))(BiCI_(3))+H_(2)O`
`2BiCI_(3) + 3H_(2)S rarr underset("Brown-BLACK ppt")(Bi_(2)S_(3)darr) +6HCI`
`Bi_(2)S_(3) +8HNO_(3) rarr 2Bi(NO_(3))_(3) +3S darr +2NO +4H_(2)O`
`2Bi(NO_(3))_(3) + 3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +6HNO_(3)`
`Bi_(2)(SO_(4))_(3) +6NH_(4)OH rarr underset((F))underset("White ppt") (2Bi(OH)_(3)darr) +3(NH_(4))_(2) SO_(4)`
`2Bi(OH)_(3) +3Na_(2)SnO_(2) rarr underset("Black ppt")underset((G))(2Bi) +3Na_(2)SnO_(3) +H_(2)O`
`2BiCI_(3) +3H_(2)SO_(4) rarr Bi_(2) (SO_(4))_(3) +underset((D))(6HCI)`
`Hg_(2)(NO_(3))_(2) +2HCI rarr underset((E))underset("White ppt")(Hg_(2)CI_(2)darr)+2HNO_(3)`
Discussion
90720.

A coloured solution known to contain two metal ions, was treated with excedss cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. dropwise addition of hydrochloric acid to the filtrate produced a white ppt. which dissolved in excess acid. treatment of the residue on filter paper with a solution of strong oxidier produced a reddishh-violet solution.. indicate any pairs of ions:

Answer»

`ZN^(2+) and MN^(2+)` IONS
`Mg^(2+) and Zn^(2+)` ions
`Mn^(2+) and Mg^(2+)` ions
`FE^(2+) and Zn^(2+)` ions

Answer :A
Discussion
90721.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. When colourless solution (C) reacts with Pb_(3)O_(4)//H^(+), it acquires a violet red colour due to formation of

Answer»

`MnO_(4)^(-)`
`PbO_(2)`
`I_(3)^(2-)`
`[NI(EN)_(3)]S_(2)O_(3)`

ANSWER :A
Discussion
90722.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. When D is boiled with alkaline sulphite solution a compound F is formed. F can be used in (I) Iodine titrations in volumetric analysis (II) Bleaching industry to destroy excess Cl_(2) (III) Photography for 'fising' films (IV) Iodometric titrations Choose the correct codes

Answer»

I and IV
I,III and IV
II and III
I,II,III and IV

Answer :D
Discussion
90723.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. Which is not correct about E

Answer»

It is COLOURLESS and higly water soluble
The MOLECULE is linear
Its aqueous solution is acidic
It turns starch iodate PAPER blue

Answer :B
Discussion
90724.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. When "B" reacts with "E"

Answer»

A new gas F will be produced
It PRODUCES D and a COLOURLESS liquid
There will be no REACTION between them
It yields B and an ACIDIC oxide

Answer :B
Discussion
90725.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. "A" probably, is

Answer»

`ZnSO_(3)`
`CoS`
`MnS`
`NiS`

Solution :`underset((A)" Pink/Buff")(MnS)+underset((dil)" colour")(H_(2)SO_(4))to underset((B)"COLOURLESS")(H_(2)S(g))+underset((C)" colourless")(MnSO_(4))`
`K_(2)Cr_(2)O_(7)+4H_(2)SO_(4)+3H_(2)S to K_(2)SO_(4) + underset((green))(Cr_(2)(SO_(4))_(3))+underset((yellow)(D))(3S)darr`
`S+O_(2)tounderset((E))(SO_(2))`
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+3SO_(2)toK_(2)SO_(4)+underset((green))(Cr_(2)(SO_(4))_(3))+H_(2)O`
`underset((B))(2H_(2))S+underset((E))(SO_(2))tounderset((D))(3S)darr+2H_(2)O`
`Na_(2)SO_(3)+StoNa_(2)S_(2)O_(3)`

hypo solution is used as an ANTICHLOR to remove excess of `Cl_(2)` from bleached articles.
`Na_(2)S_(2)O_(3)+Cl_(2)+H_(2)O to Na_(2)SO_(4)+S+2HCl`
`2MN^(2+)+5PbO_(2)+4H^(+) to underset("violet red")(2MnO_(4)^(-))+5Pb^(+2)+2H_(2)O`
Discussion
90726.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. Which is not correct about E ?

Answer»

It is COLOURLESS and HIGHLY water soluble
The MOLECULE is linear
Its AQUEOUS solution acidic
it TURNS starch iodate paper blue

Solution :
Discussion
90727.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. When colourless solution (C) reacts with Pb_(3)O_(4)//H^(+), it acquries a violet red colour due to formation of :

Answer»

`MnO_(4)^(-)`
`PbO_(2)`
`I_(3)^(-)`
`[Ni(en)_(3)]S_(2)O_(3)`

SOLUTION :
Discussion
90728.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. When D is boiled with alkaline sulphite solution a compound F is formed. F can be used in (I) Iodine titrations in volumetric analysis (II) Bleaching industry to destroy excess Cl_(2) (III) Photography for 'fixing' films (IV) Iodometric titrations Choose the correct codes:

Answer»

I and IV
I, III and IV
II and III
I, II, III and IV

Solution :
Discussion
90729.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. When "B" racts with "E":

Answer»

a NEW gas F will be PRODUCED
It produced D and a colourless liquid
there will be no reaction between them
it yields B and an ACIDIC oxie

Solution :
Discussion
90730.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. "A" probably, is:

Answer»

`ZnSO_(3)`
`COS`
`MnS`
`NIS`

SOLUTION :
Discussion
90731.

A colloidal system in which the dispersed phase has very little affinity for the dispersion medium is called

Answer»

LYOPHILIC
LYOPHOBIC
solid
aerosol

Answer :B
Discussion
90732.

A colloidal system in which gas bubbles are dispersed in a liquid is known as

Answer»

FOAM
AEROSOL
SOL
EMULSION

SOLUTION :foam
Discussion
90733.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as …….

Answer»

SOLID SOL
gel
EMULSION
sol

SOLUTION :sol
Discussion
90734.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as............

Answer»

SOLID SOL
gel
EMULSION
sol

SOLUTION :sol
Discussion
90735.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as

Answer»

SOLID SOL 
Gel
emulsion 
sol 

ANSWER :D
Discussion
90736.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as………..

Answer»

SOLID SOL
GEL
EMULSION
sol

ANSWER :D
Discussion
90737.

All colloidal solutions show :

Answer»

very high OSMOTIC PRESSURE
high osmotic pressure
LOW asmotic pressure
no osmotic pressure

Answer :C
Discussion
90738.

A colloidal system has particles of what size ?

Answer»

`10^-4m` to `10^-10m`
`10^-5m` to `10^-7m`
`10^-9m` to `10^-12m`
`10^-6m` to `10^-9m`

ANSWER :D
Discussion
90739.

A colloidal solution of ferric oxide is prepared by two different methods as shown below. a. What is the charge on colloindal particles in the two test tubes (A) and (B)? b. Give reasons for the origin of charge.

Answer»

Solution :Colloidal PARTICLES of test tube (A) are POSITIVELY charged where as colloidal particles of test tube (B) are NEGATIVELY charged.
In test tube (A). `Fe^(3+)` is adsorbed on the precipitate
`Fe_(2)O_(3).xH_(2)O` [or `Fe_(2)O_(3).xH_(2)O//Fe^(3+)` is formed].
In test tube (B). `OVERSET(ɵ)(OH)` ions is adsorbed on the precipitate
`Fe_(2)O_(3).xH_(2)O` [or `Fe_(2)O_(3).xH_(2)O//overset(ɵ)(OH)` is formed].
Discussion
90740.

A colloidal solution of arsenious sulphide is most readily coagulated by the addition of a normal solution ?

Answer»

`NaCl`
`CaCl_(2)`
`Na_(3)PO_(4)`
`Al_(2)(SO_(4))_(3)`

Solution :ARSENIOUS sulphide is negatively CHARGED sol so more the CHARGE on cation of ELECTROLYTE, more the efficiency of electrolyte for coagulation.
Discussion
90741.

A colloidal solution of Agl is prepared by two different methods shown below: (i) What is the charge of Agl colloidal particles in the two testtubes (A) and (B)? (ii) Give reasons for the origin of charge.

Answer»

Solution :(i) When `AgNO_3` is added to KI solution , the ppt. of AgI will adsorb `I^(-)` ions from the dispersion medium. THUS, the colloidal particles of AgI will acquire negative charge.
When KI is added to `AgNO_3` solution , the ppt. of AgI will adsorb `Ag^(+)` ions. Thus , colloidal particles of AgI will acquire positive charge.
(II) Origin of charge can be explained in terms of ADSORPTION of ions from the dispersion medium and with the help of Helmholtz electrical DOUBLE LAYER.
Discussion
90742.

A colloidal solution of a solid as dispersed phase and liquid as dispersion medium is known as :

Answer»

Gel
Sol
Solid foam
Emulsion

Solution :N//A
Discussion
90743.

A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl_(2) and AlCl_(3) solutions. Their coagulating power should be

Answer»

`NaClgt BaCl_(2)gtAlCl_(3)`
`BaCl_(2)gtAlCl_(3)gtNaCl`
`AlCl_(3)gtBaCl_(2)gtNaCl`
`BaCl_(2)gtNaClgtAlCl_(3)`

Answer :C
Discussion
90744.

A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl_2and AIC_3solutions. Their coagulating power should be

Answer»

`NACL GT BaCl_2 gt AlCl_3`
`BaCl_2 gt AlCl_3 gt NaCl`
`AlCl_3 gt BaCl_2 gt NaCl` s
`BaCl_2 gt NaCl gt AlCl_3`

ANSWER :C
Discussion
90745.

A colloidal solution is subjected on electrical field. The particles move towards anode. The coagulation of the same solution is studied using NaCl, BaCl_(2) and AlCl_(3) solution. Their coagulating power should be

Answer»

`NACL gt BaCl_(2) gt AlCl_(3)`
`BaCl_(2) gt AlCl_(3) gt NaCl`
`AlCl_(3) gt BaCl_(2) gt NaCl`
`BaCl_(2) gt NaCl gt AlCl_(3)`

SOLUTION :Coagulating POWER `prop` charge on coagulating ION.
Discussion
90746.

A colloidal solution in which a solid is dispersed in a liquid is called

Answer»

GEL
Emulsion
Sol
Precipitate

Answer :C
Discussion
90747.

A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called

Answer»

TYNDALL effect
Brownian effect
Hardy schulze effect
None of these

Answer :A
Discussion
90748.

(A) Colloidal sols scatter light while true solutions do not. (R ) The paricalsin the colloidal sol move much slower than that of the true solution

Answer»

Both (A) and (R ) are true and (R ) is the CORRECT explanation of (A)
Both (A)and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is FALSE
Both (A) and (R ) are false

ANSWER :B
Discussion
90749.

A colloidal sol Fe(OH)_(3) in water is

Answer»

A HYDROPHILIC COLLOID
A HYDROPHOBIC colloid
An emulsion
Not a colloid

ANSWER :B
Discussion
90750.

A colloidal sol is prepared by the given method in figure. What is the charge on hydrated ferric oxdide colloidal particles formed in the test tube? How is the sol represented?

Answer»

SOLUTION :Negative CHARGE, `Fe_(2)O_(3), XH_(2)O // OH^(-)`
Discussion